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[Keyword='WET DEPOSITION']

The Mercury Deposition Network: A National Atmospheric Deposition Program (NADP) Network

Entry ID:
NADP_MDN

Summary

Abstract:
The Mercury Deposition Network (MDN) is a national database of weekly concentrations of total mercury in precipitation and the seasonal and annual flux of total mercury in wet deposition. The data is used to develop information on spatial and seasonal trends in mercury deposited to surface waters, forested watersheds, and other sensitive receptors. The MDN is part of the National Atmospheric ... Deposition Project (NADP) Network.

Analysis of precipitation samples for total- and methylmercury is performed by Frontier Geosciences, Inc., Seattle WA, USA. Frontier Geosciences provides the environmental sciences community with uncompromisingly high-quality contract research, project design and management, and analytical chemistry services concerned with the sources, fate and effects of trace metals.

The MDN began a transition network of 13 sites in 1995. Beginning in 1996, MDN became an official network in NADP with 26 sites in operation. Over 30 sites were in operation during 1998. The MDN is anticipated to operate for a minimum of five years and will be managed at the NADP Coordination Office. The network uses standardized methods for collection and analyses. Weekly precipitation samples are collected and analyzed by Frontier Geosciences in Seattle, WA. The MDN provides data for total mercury, but also includes methylmercury if desired by a site sponsor. Data are available for the transition network (1995) and for the 1996 and 1997 operating years.